Alert archive / Illinois / Tornado Watches in 2010
Tornado Watch 768
The Storm Prediction Center issued this tornado watch at Dec 31, 2010, 10:34 AM CST for 19 counties in Illinois. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Dec 31, 2010, 10:34 AM CST (16:34 UTC)
- Expired
- Dec 31, 2010, 1:18 PM CST
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
Counties Cass County, IL, Christian County, IL, DeWitt County, IL, Fulton County, IL, Logan County, IL, Macon County, IL, Mason County, IL, McLean County, IL, Menard County, IL, Morgan County, IL, Moultrie County, IL, Peoria County, IL, Piatt County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Shelby County, IL, Tazewell County, IL, Woodford County, IL
The radar
The Lincoln radar (KILX), 72 km from the middle of the area, began a volume at 16:35 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 40%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
6 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 31, 10:47 AM CST | Tornado Warning | ILX | Cass, Morgan, Scott | 43 min |
| Dec 31, 11:40 AM CST | Tornado Warning | ILX | Peoria, Tazewell, Woodford | 50 min |
| Dec 31, 12:00 PM CST | Tornado Warning | ILX | Morgan | 30 min |
| Dec 31, 12:13 PM CST | Tornado Warning | ILX | Logan, Mason, Menard, Tazewell | 32 min |
| Dec 31, 12:37 PM CST | Tornado Warning | ILX | Logan, Mason, Menard | 38 min |
| Dec 31, 1:10 PM CST | Tornado Warning | ILX | McLean, Woodford | 50 min |
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 4.6 hours before the alert went out and 131 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 506 m above ground
- 0-6 km bulk shear
- 58 kt
- 0-1 km storm-relative helicity
- 450 m²/s²
- 0-3 km storm-relative helicity
- 427 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 31, 12:44 AM CST | Mesoscale Discussion | SPC | Calhoun | 61 min |
| Dec 31, 2:25 AM CST | Severe Thunderstorm Watch | SPC | Madison, Monroe, Saint Clair | 2 hr |
| Dec 31, 4:05 AM CST | Mesoscale Discussion | SPC | Bond, Calhoun, Greene, Jersey, Macoupin, Madison and 3 more | 115 min |
| Dec 31, 5:45 AM CST | Mesoscale Discussion | SPC | Calhoun | 2 hr |
| Dec 31, 7:29 AM CST | Tornado Watch | SPC | Bond, Brown, Calhoun, Clinton, Fayette, Greene and 10 more | 8 hr |
| Dec 31, 11:04 AM CST | Mesoscale Discussion | SPC | Alexander, Clinton, Edwards, Franklin, Hamilton, Jackson and 14 more | 56 min |
| Dec 31, 11:42 AM CST | Tornado Watch | SPC | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more | 7 hr |
| Dec 31, 1:16 PM CST | Tornado Watch | SPC | Champaign, Christian, Clark, Clay, Coles, Crawford and 22 more | 6 hr |
| Dec 31, 2:12 PM CST | Mesoscale Discussion | SPC | Alexander, Champaign, Clark, Clay, Coles, Crawford and 30 more | 93 min |
| Dec 31, 1:03 AM CST | Tornado Watch | SPC | Barry, Barton, Benton, Camden, Cedar, Christian and 24 more | 7 hr |
| Dec 31, 3:27 AM CST | Mesoscale Discussion | SPC | Barry, Barton, Benton, Camden, Cedar, Christian and 18 more | 2 hr |
| Dec 31, 3:56 AM CST | Mesoscale Discussion | SPC | Andrew, Buchanan, Caldwell, Clay, Clinton, Daviess and 3 more | 3 hr |
| Dec 31, 4:56 AM CST | Mesoscale Discussion | SPC | Bollinger, Butler, Carter, Madison, Oregon, Reynolds and 2 more | 2 hr |
| Dec 31, 5:35 PM CST | Mesoscale Discussion | SPC | Dunklin, Pemiscot | 115 min |
Nearby
Tornado Watches in Illinois, 2010Every tornado watch in 2010
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.